TABLE 1.

Characteristics of study participants who did not complete 24‐hour urine collection

Characteristics	Total number	Did not complete
		Number	%
Overall	2388	789	33.0
Region**
Bangkok	398	234	58.8
Central	496	172	34.7
North	496	164	33.1
Northeast	498	156	31.3
South	500	63	12.6
Area**
Urban	1158	461	39.8
Rural	732	172	23.5
Sex**
Male	1162	414	35.6
Female	1226	375	30.6
Age groups**
18‐29 years	571	198	34.7
30‐44 years	606	170	28.1
45‐59 years	655	201	30.7
60 years and above	554	218	39.4
Education level**
Primary	828	305	36.8
Secondary and above	1484	458	30.9
Income (Thai baht per month)**
Low (0‐9,999)	1654	506	30.6
Medium (10,000‐19,999)	466	187	40.1
High (20,000 and above)	181	66	36.5
Body mass index (Kg/m2)**
<18.5	205	104	50.7
18.5‐24.9	1245	475	38.2
25 and above	868	187	21.5
Hypertension*
Yes	695	221	31.8
No	1628	545	33.5
History of diabetes**
Yes	195	83	42.6
No	2128	683	32.1
Marital status
Married	1341	419	31.2
Single	672	243	36.2
Separate/Divorce/Other	309	103	33.3

^*Hypertension was defined as anyone with systolic blood pressure ≥ 140 and or diastolic blood pressure ≥ 90 mm Hg or taking medication for hypertension.

^** p‐value < 0.05 when compared with participants who completed urine collection.